I could see a case made for Temple of Doom. I think it's a great movie still. It doesn't sync up as well with the other two legit ones in terms of scope or Nazi count, so it's just natural that people in general go for Raiders and Last Crusade.
I'm in the middle of finals week and this past weekend I went to see my little brother in the hospital. I haven't had the time. But I now own the DVD thanks to my Secret Santa; I will watch it when I'm done with finals, and before Christmas as promised.